Control system for and control method of hybrid vehicle

A control system for a hybrid vehicle provided with an internal combustion engine and an electric motor, wherein a variable restriction zone, for which a restricted period and a permitted period are set in advance, is provided in advance, the operation of the internal combustion engine is restricted within the variable restriction zone during the restricted period, and the operation of the internal combustion engine is permitted within the variable restriction zone during the permitted period,

• the control system comprising:
• a driving control unit configured to, when it is determined that the hybrid vehicle is located within the variable restriction zone during the restricted period, restrict the operation of the internal combustion engine and operate the electric motor so as to drive the hybrid vehicle;
• and
• a SOC control unit configured to, when it is determined that a time from a current timing, at which the hybrid vehicle is located outside the variable restriction zone or within the variable restriction zone during the permitted period, to a position start timing, at which the hybrid vehicle starts to be located within the variable restriction zone during the restricted period, is shorter than a predetermined set time, increase the rate of increase of an SOC of a battery of the hybrid vehicle or decrease the rate of decrease of the SOC, when compared with a case in which it is determined that the time from the current timing to the position start timing is longer than the set time.